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參數(shù)資料
| 型號(hào)： | A1181 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Two-Wire, Programmable, Chopper-Stabilized, Unipolar Hall-Effect Switch |
| 中文描述： | 兩線，可編程，斬波穩(wěn)定，單極霍爾效應(yīng)開關(guān) |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 356K |
| 代理商： | A1181 |
12
A1180-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
A1180/81/82/83
PROGRAMMING PROTOCOL CHARACTERISTICS
, over operating temperature range, unless otherwise noted
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Programming Voltage1
VPL
Minimum voltage range during programming
4.5
5.0
5.5
V
VPM
11.5
12.5
13.5
V
VPH
25.0
26.0
27.0
V
Programming Current2
IPP
tr = 11 μs; 5 V → 26 V; CBYP = 0.1 μF
-
190
-
mA
Pulse Width
td(0)
OFF time between programming bits
20
-
μs
td(1)
Pulse duration for enable and addressing
sequences
20
-
μs
td(P)
Pulse duration for fuse blowing
100
300
-
μs
Pulse Rise Time
tr
VPL to VPM; VPL to VPH
5-
20
μs
Pulse Fall Time
tf
VPM to VPL; VPH to VPL
5
-
100
μs
1
Programming voltages are measured at the VCC pin.
2
A bypass capacitor with a minimum capacitance of 0.1 μF must be connected from VCC to the GND pin of the A118x device in order to
provide the current necessary to blow the fuse.
VPH
V+
t
VPM
VPL
0
Td(1)
Td(0)
Td(P)
Figure 4. Pulse amplitudes and durations
Additional information on device programming and program-
ming products is available on www. allegromicro.com. Program-
ming hardware is available for purchase, and programming
software is available free of charge.
Programming Protocol
The operate switchpoint, BOP, can be eld-programmed. To do
so, a coded series of voltage pulses through the VCC pin is used
to set bitelds in onboard registers. The effect on the device
output can be monitored, and the registers can be cleared and
set repeatedly until the required BOP is achieved. To make the
setting permanent, biteld-level solid state fuses are blown, and
nally, a device-level fuse is blown, blocking any further cod-
ing. It is not necessary to program the release switchpoint, BRP,
because the difference between BOP and BRP, referred to as the
hysteresis, BHYS, is xed.
The range of values between BOP(min) and BOP(max) is scaled to
31 increments. The actual change in magnetic ux (G) repre-
sented by each increment is indicated by BRES (see the Operating
Characteristics table; however, testing is the only method for
verifying the resulting BOP). For programming, the 31 incre-
ments are individually identied using 5 data bits, which are
physically represented by 5 bitelds in the onboard registers.
By setting these bitelds, the corresponding calibration value is
programmed into the device.
Three voltage levels are used in programming the device: a low
voltage, VPL , a minimum required to sustain register settings; a
mid-level voltage, VPM , used to increment the address counter
in the device; and a high voltage, VPH , used to separate sets of
VPM pulses (when short in duration) and to blow fuses (when
long in duration). A fourth voltage level, essentially 0 V, is used
to clear the registers between pulse sequences. The pulse values
are shown in the Programming Protocol Characteristics table and
in gure 4.
Code Programming.
Each biteld must be individually set. To
do so, a pulse sequence must be transmitted for each biteld that
is being set to 1. If more than one biteld is being set to 1, all
pulse sequences must be sent, one after the other, without allow-
ing VCC to fall to zero (which clears the registers).
The same pulse sequence is used to provisionally set bitelds as
is used to permanently set biteld-level fuses. The only differ-
ence is that when provisionally setting bitelds, no fuse-blowing
pulse is sent at the end of the pulse sequence.
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